Charles Weidman (1901-1975) was a dancer, choreographer, and teacher known for his roles as a member of the Denishawn Company, and later for founding his own companies: the Humphrey-Weidman Concert Company, Theatre Dance Company, and An Expression of Two Arts. The additions to the Charles Weidman papers contain material related to choreographed works he performed with the Theatre Dance Company and An Expression of Two Arts; files representing his time with the Denishawn Dancers; photographs; and scrapbooks.

Serge Prokofiev (1891–1953) was a Russian and Soviet composer, pianist and conductor, and seminal figure in the history of twentieth-century music. The Serge Prokofiev Archive (SPA) contains 58 original music manuscripts and over 10,000 letters and documents primarily from 1918-1936, the years Prokofiev spent in the West. The SPA also includes an expansive collection of music manuscript copies, published scores, concert programs, scholarly books and articles, photographs, and audio and video material, making it the premier research collection for studying Prokofiev's life, work and legacy.